Staggered-tooth cutter for dressing abrasive elements



F. C. BRAN DEN BU HG. STAGGERED TOOTH CUTTER FOR DRESSING ABRASII/EELEMENTS.

APPLICATION FILED MAY 22, I920- 1,423,075,

Patented July 18, 1922..

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FRANCIS C. BRANDENB'URG, 01E PIQUA, OHIO.

STAGGERED-TOOTH CUTTER FOB DRESSING ABRASIVE ELEMENTS.

resents.

1 0 all w from it may concern Be it known that I, FRANCIS C. BRANDEN-BURG, a citizen of the United States, residing t Piqua, in the county ofMiami and State of Ohio, have invented certain new and usefulImprovements in Staggered-Tooth Cut ters for Dressing Abrasive Elements,of which the following is a specification.

This invention relates to cutters for emery wheel dressing tools and hasas its object to provide an improved form of cutter for rough dressingemery wheels, the cutter being specially designed for use in connectionwith the tool forming the subject matter of my Patent No. 1042761,issued Qctober 29, 1912, and the improvement thereon shown in mycopending application filed April 10, 1919, Serial No. 288,934.

The invention has as a particular object the provision of a tool whichwill impart a spirally roughened face to the emery or other abrasivewheel being rough dressed, and which will evenly and yet rapidly actupon the face of the wheel to dress the same.

A further object of the invention is to provide a cutter, the individualunits of which may be pressed or stamped from sheet metal and thusmanufactured at low cost.

Another object of the invention resides in providing a cutter the unitsof which are so assembled with respect to each that when grouped.together in their assembled relation they are held against rotation pastone another and yet may have limited relative rotative movement to adesired extent and likewise a limited longitudinal movement.

The invention further provides a cutter having sharp staggered teethwhich are especi ally adapted for spirally corrugating the face of anabrasive wheel.

In the accompanying drawing:

Figure 1 is a side elevation of the cutter embodying the presentinvention mounted in the head of the tool in connection with which it isto be employed and illustrating the manner of using the tool;

Fig. 2 is an edge view of the cutter comprising the assembled units;

Fig. 3 is a side elevation of one of the units;

Fig. 4; is a vertical sectional view on the line ll of Fig. 3, the viewalso illustrating one of a pair of spacing or thrust washers employed inconnection with the cutter;

Specification of Letters Patent. Pat'gnted July is 1922 Applicationfiled May 22, 1920. 9

Serial No. 383,435.

Fig.5 is a view similar to Fig. 2 but with the units rotated relative toeach other and moved to the desired limited extent longitudinally, theposition which they assume when dressing the wheel.

As the tool itself is described and claimed in my patent and in myco-pending appliprovided with spaced cheek pieces 2 between which thecutter is mounted, and in which cheelr pieces there is rotatably mounteda bearing spindle for the cutter indicated by the numeral 3. The cuttercomprises an assemblage of units, and as these units are all ofidentical construction, a description of one will sufiice. Each oftheseunits, indicated in general by the numeral 4, is, stamped or pressedfrom a circular sheet metal blank, and in the stamping or pressingoperation the blank is formed with a number of in .cisions 5 ofV-shaped' form defining the teeth of the unit. This arrangement of theincisions forms V -shaped teeth 6 in the peripheral portion of. theunit, the incisions and teeth alternating, as clearly shown in Figure30f the drawings and providing pointed teeth. The unit is formed with acentral opening 7 to receive the spindle 3 and each unit comprises a webportion 8 lying within the circle touched by the inner ends of all theincisions, the incisions being all substantially of the same depth. Thisweb portion is fiat upon both of its faces and, of course, when the unitis fitted upon its spindle, occupies a plane at right angles to the axisofthe spindle.

While the teeth are indicated in general by the numeral 6 and are allpointed, I have designated certain of the teeth of the unit by thenumeral 9 and others by the numeral 10. Referring to Figures 2, 3 and 4of the drawings, it will be observed that the teeth 9 and 10 lie orextend at opposite sides of the plane occupied by the web portion of theunit, and the said teeth 9 and 10 are.

alternately arranged. It will further be observed that while the teethof each set are each set are correspondingly helically dis:

posed with relation to the axis of the unit. In other words, the teethof each set are distorted or twisted so that their common line ofcurvature is helical, to the axis of the unit. Also it will be evidentfrom the drawings that while the teeth 9 and 10 are located on oppositesides of the plane of the web of the unit, their outer edges are allinclined in the same direction and extend along lines spiral to the axisof the unit.

in building up the cutter, the desired number of units are placed inassembled relation side by side upon the spindle 3 and when so disposedthe side faces of the teeth of one unit will contact with the side facesof the teeth of the next adjacent unit throughout the series. Also it isevident that when the units are properly assembled they will, in asense, interlock so that relative rotation of the units with respect toeach other is positively prevented except that there may be a slightrelative movement displacing the teeth of the one unit progressivelywith respect to the teeth of the other .units or that is to say, thecombined correspending teeth will be displaced relative to each otherthrough a slight are dependent upon the amount of lateral displacementof the cutter units on the spindle 3. The lateral displacementis limitedby the provision upon the spindle 3 at opposite sides of the assemblageof units, of washers 11 which contact the outer faces of the 'webportions 8 of the end units of the assemblage and also the inner oropposing faces of the cheek pieces 2 of the head of the tool 1, andwhich are of sufficient thickness to space the teeth from the said checkpieces so that in rotation of the cutter said teeth will not contactwith the inner faces of the cheek pieces and interfere with rotation ofthe cutter upon its spindle.

I claim:

1. A cutter for a dressing tool comprising an assemblage of cutter unitseach having a peripheral series of sharp-pointed staggered teeth havingtheir side faces extending diagonally of the axis of the unit,corresponding teeth of the units lying side by side throughout theseries and presentingtheir sharp points to the face of the work piece.

2 A cutter for a dressing tool comprising an assemblage of cutter unitseach having a peripheral series of sharp-pointed staggered teeth theunits being arranged side by side and the teeth of adjacent unitsinterlocking in a manner to permit a limited relative rotativedisplacementof the teeth in one direction and presenting their sharppoints to the face of the work piece.

3. A cutter for a dressing tool comprising an assemblage of cutter unitseach having a peripheral series of helically disposed sharppointedstaggered teeth, a spindle upon which the units are rotatably mountedside by side, the teeth of adjacent units interlocking, and means uponthe spindle to limit relative lateral separation of the units, saidteeth presenting their sharp points to the face of the work piece.

4. A cutter for a dressing tool comprising a plurality of cutter unitsclosely assembled on a spindle, each unit being provided with an evennumber of sharp pointed teeth extending radially from the body of theunit and alternate teeth being bent to right and left from a planerunning transversely to the spindle axis; the sharp points of the teethof the assembled cutter forming a helical line with relation to saidaxis and said sharp points being directed against the face of the workpiece.

In testimony whereof I afliX my signature.

FRANCIS C. BRANDENBURG. [L.S.]

